| The objective of this study is to analyze and extract the principle of operation,potentials and challenges of different ignition concepts including spark ignition andcompression ignition. These conventional configurations were compared to the notwidely spread dual ignition and homogenous charge compression ignition (HCCI)configuration. Results of simulations based on a quasi-dimensional model andexperiments based on a modified test engine were then examined and comparisonswere conducted. Furthermore efficiency increase potentials were analyzed forhydrogen enriched compressed natural gas (HCNG). Emission figures were taken intoconsideration for not only different ignition concepts, but also for varying hydrogenfractions in the HCNG fuel. The results show a promising potential for HCCIregarding thermal efficiency under narrow load conditions. The implementation ofHCCI for wide operating conditions requires further adjustments and research. InAddition the results illustrate that HCNG as a fuel is a strong candidate regardinggreener fuels for increasing fuel economy demand and stricter emission regulations. |
PDF Full Text Request